Method Implemented in a User Equipment

• US 20130163537A1
• Filed: 12/19/2012
• Published: 06/27/2013
• Est. Priority Date: 12/23/2011
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Anderson, Nicholas William, Harrison, Robert Mark, Novak, Robert, Vutukuri, Eswar
• Granted Patent: US 9,247,563 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

In some implementations, a method implemented in a user equipment UE for single carrier frequency division multiple access SC-FDMA within a wireless system includes receiving an assignment of a plurality of uplink scheduling request resources and comprising a plurality of SC-FDMA subcarriers of the wireless system. One of the plurality of uplink scheduling request resources is selected for transmission of scheduling requests. It is determined that a change in uplink scheduling request resource should be made. Upon determining that a change in scheduling request resource should be made, another of the assigned uplink scheduling request resources is selected for transmission of scheduling requests.

Claims

1. A method implemented in a user equipment UE for single carrier frequency division multiple access SC-FDMA within a wireless system comprising:

receiving an assignment of a plurality of uplink scheduling request resources and comprising a plurality of SC-FDMA subcarriers of the wireless system;

selecting one of the plurality of uplink scheduling request resources for transmission of scheduling requests;

determining that a change in uplink scheduling request resource should be made; and

upon determining that a change in scheduling request resource should be made, selecting another of the assigned uplink scheduling request resources for transmission of scheduling requests.

2. A method according to claim 1 wherein each of the plurality of uplink scheduling request resources is associated with a scheduling request resource type;

and

determining that a change in uplink scheduling request resource should be made comprises determining that a change in uplink scheduling request resource type should be made.

3. A method according to claim 1 wherein at least one of the assigned scheduling request resources comprises a shared SC-FDMA resource assigned to a plurality of UEs of the wireless system and at least one other of the assigned scheduling request resources comprises a dedicated SC-FDMA resource assigned only to the UE.

4. A method according to claim 1 wherein a plurality of the assigned scheduling request resources comprise dedicated SC-FDMA resources assigned only to the UE.

5. A method according to claim 1 wherein a plurality of the assigned scheduling request resources are shared SC-FDMA resources, each assigned to a plurality of UEs of the wireless system.

6. A method according to claim 1 wherein determining that a change of scheduling request resource should be made comprises detecting a change in activity of the UE based on one or more of:

a current data activity status or a data activity level relating to the UE;

an activity relating to one or more applications resident on the UE;

an activity relating to services or logical channels associated with the UE;

a discontinuous reception timer, DRX state or sub-state;

a change in pattern relating to a DRX;

a determination of whether one or more timers controlling DRX behaviour are running or have expired;

a determination or measurement of pathloss between the eNB and the UE;

a determination or measurement of a downlink carrier to interference C/I or downlink carrier to interference-plus-noise C/N+I;

a determination or measurement of a uplink carrier to interference C/I or uplink carrier to interference-plus-noise C/N+I;

an uplink data rate for the UE;

an uplink modulation and coding scheme for the UE;

a ratio of maximum UE transmit power to a current UE transmit power.

7. A method according to claim 1 wherein determining that a change of scheduling request resource should be made comprises receiving an explicit signal from an eNB specifying which assigned scheduling request resource to use.

8. A method according to claim 1 further comprising:

upon determining a need to transmit on scheduled SC-FDMA uplink resources within the wireless system;

encoding a user ID; and

transmitting a signal comprising the encoded user ID on the selected scheduling request resource.

9. A method according to claim 8 wherein the signal is an uplink control channel signal.

10. A method according to claim 9 wherein the signal comprises a Physical Uplink Control Channel PUCCH format 2 or format 3 signal.

11. A method according to claim 9 wherein the step of encoding comprises using a block forward error correction FEC encoder.

12. A method according to claim 8 wherein the signal is an uplink shared channel signal.

13. A method according to claim 12 wherein the uplink signal comprises a Physical Uplink Shared Channel PUSCH signal.

14. A method according to claims 12 wherein the step of encoding comprises using a turbo forward error correction FEC encoder.

15. A method according to claim 8 wherein encoding the user ID comprises generating encoded bits, and the method further comprises:

modulating the encoded bits to produce modulated symbols;

spreading the modulated symbols;

mapping each of the spread modulated symbols to the plurality of subcarriers of the selected SC-FDMA scheduling request resource in the wireless system; and

transmitting a signal comprising the plurality of SC-FDMA subcarriers in the wireless system.

16. A method according to claim 1 wherein said assignment of at least one of the plurality of scheduling request resources is received from a broadcast transmission or common signalling message transmitted by an eNB of the wireless system.

17. A method according to claim 1 wherein said assignment of at least one of the plurality of scheduling request resources is received from a dedicated transmission to the UE by an eNB of the wireless system.

18. A method according to claim 8 wherein the user ID is related to Cell Radio Network Temporary Identifier C-RNTI.

19. A method according to claim 8 wherein at least one of the assigned scheduling request resources are within a PUCCH frequency region of an uplink system bandwidth of the wireless system.

20. A method according to claim 8 wherein at least one of the assigned scheduling request resources are within a PUSCH frequency region of an uplink system bandwidth of the wireless system.

21. A method according to claim 8 wherein SC-FDMA is used by the UE for sending uplink communication signals.

22. A method according to claim 8, wherein a modulation scheme other than SC-FDMA is used for downlink communication signals received by the UE.

23. A user equipment UE for single carrier frequency division multiple access SC-FDMA within a wireless system operable to perform a method according to claim 1.

24. A wireless system comprising at least one UE according to claim 23.

25. A computer-readable medium comprising executable instructions that upon execution by a device perform a method according to claim 1.